A group of 3 or more Eastern Asians walking side-by-side at minimal speed down the sidewalk leaving absolutely no space to get around them. Most commonly ocurring at Ivy league schools and cities with high populations of Eastern Asian students.

Professor: "Why were you over 15 minutes late to class today?"
Student: "Well, I would have been on time if it weren't for all those asians paying tribute to the Great Wall of China on the sidewalks."
Professor: "If the mongolians could get past it, so can you"